Woke up at around 1:00am, and started some lunar imaging at f/10 using C8. Transparency was so poor that even f/20 will need 100% gain. So, forced to conduct a low power game. Some nice sights were captured.
Later tried on Jupiter, no chance to collimate on any star, and I used one of the Jovian satellite to check collimation, seems not bad. Anyway. At f/20, the detail level is even less than f/10 due to overwhleming noise.
But someone else managed to get f/30 shots... how come?! shall really investigate.